<template>
  <div ref="echart" class="echartDiv"></div>
</template>
 
<script setup>
  import * as echarts from 'echarts'
  import 'echarts-gl'
  import { onMounted, toRefs, ref, reactive } from 'vue'

  const echart = ref(null)

  let state = reactive({
    xAxisData: ['老刘', '小妍', '小梦', '小李', '小王', '老王'],
    yAxisData: [4, 22, 1, 11, 23, 11],
    yAxisData1: [1, 1, 1, 1, 1, 1],
    echart: ref(null),
  })

  // 传入数据生成 option
  const optionsData = [
    {
      name: '待办',
      value: 4256,
      itemStyle: {
        //   opacity: 0.5,
        color: 'rgba(15, 213, 247, 0.935)',
      },
    },

    {
      name: '已办',
      value: 2356,
      itemStyle: {
        //   opacity: 0.5,
        color: 'rgb(253, 251, 253)',
      },
    },
    {
      name: '未处理',
      value: 2018,
      itemStyle: {
        //   opacity: 0.5,
        color: 'rgb(4, 245, 92)',
      },
    },
    {
      name: '忽略',
      value: 1998,
      itemStyle: {
        //   opacity: 0.5,
        color: 'rgba(245, 64, 4, 0.958)',
      },
    }
  ]

  //挂载
  onMounted(() => {
    echartInit()
  })

  const echartInit = () => {
    var myChart = echarts.init(echart.value)
    const series = getPie3D(optionsData, 0.8, 240, 28, 26, 0.5)
    series.push({
      name: 'pie2d',
      type: 'pie',
      label: {
        show: false,
        opacity: 1,
        fontSize: 14,
        lineHeight: 20,
        textStyle: {
          fontSize: 14,
          color: '#fff',
        },
      },
      labelLine: {
        show: false,
        length: 30,
        length2: 30,
      },
      startAngle: -30, //起始角度，支持范围[0, 360]。
      clockwise: false, //饼图的扇区是否是顺时针排布。上述这两项配置主要是为了对齐3d的样式
      radius: ['40%', '60%'],
      center: ['50%', '50%'],
      data: optionsData,
      itemStyle: {
        opacity: 0,
      },
    })

    // 准备待返回的配置项，把准备好的 legendData、series 传入。
    let option = {
      legend: {
        show: true,
        tooltip: {
          show: true,
        },
        orient: 'vertical',
        data: ['待办', '已办', '未处理', '忽略'],
        top: 'center',
        itemGap: 14,
        itemHeight: 8,
        itemWidth: 17,
        right: '2%',
        textStyle: {
          color: '#fff',
          fontSize: 10,
        },
      },
      animation: true,
      tooltip: {
        formatter: (params) => {
          if (
            params.seriesName !== 'mouseoutSeries' &&
            params.seriesName !== 'pie2d'
          ) {
            return `${
              params.seriesName
            }<br/><span style="display:inline-block;margin-right:5px;border-radius:10px;width:10px;height:10px;background-color:${
              params.color
            };"></span>${
              option.series[params.seriesIndex].pieData.value + '人'
            }`
          }
        },
        textStyle: {
          fontSize: 14,
        },
      },
      title: {
        x: 'center',
        top: '20',
        textStyle: {
          color: '#fff',
          fontSize: 14,
        },
      },
      // backgroundColor: '#0E3567',
      labelLine: {
        show: false,
        lineStyle: {
          color: '#7BC0CB',
        },
        normal: {
          show: true,
          length: 10,
          length2: 10,
        },
      },
      label: {
        show: false,
        position: 'outside',
        formatter: '{b} \n{d}%',
        textStyle: {
          color: '#fff',
          fontSize: '14px',
        },
      },
      xAxis3D: {
        min: -1,
        max: 1,
      },
      yAxis3D: {
        min: -1,
        max: 1,
      },
      zAxis3D: {
        min: -1,
        max: 1,
      },
      grid3D: {
        show: false,
        boxHeight: 0.01,
        //top: '30%',
        bottom: '50%',
        // environment: "images/guang-quan.png",
        viewControl: {
          distance: 180,
          alpha: 25,
          beta: 60,
          autoRotate: true, // 自动旋转
        },
      },
      series: series,
    }
    // 使用刚指定的配置项和数据显示图表。
    myChart.setOption(option)
  }

  function getParametricEquation(startRatio, endRatio, isSelected, isHovered, k, height) {
    // 计算
    let midRatio = (startRatio + endRatio) / 2

    let startRadian = startRatio * Math.PI * 2
    let endRadian = endRatio * Math.PI * 2
    let midRadian = midRatio * Math.PI * 2

    // 如果只有一个扇形，则不实现选中效果。
    if (startRatio === 0 && endRatio === 1) {
      isSelected = false
    }

    // 通过扇形内径/外径的值，换算出辅助参数 k（默认值 1/3）
    k = typeof k !== 'undefined' ? k : 1 / 3

    // 计算选中效果分别在 x 轴、y 轴方向上的位移（未选中，则位移均为 0）
    let offsetX = isSelected ? Math.cos(midRadian) * 0.1 : 0
    let offsetY = isSelected ? Math.sin(midRadian) * 0.1 : 0

    // 计算高亮效果的放大比例（未高亮，则比例为 1）
    let hoverRate = isHovered ? 1.05 : 1

    // 返回曲面参数方程
    return {
      u: {
        min: -Math.PI,
        max: Math.PI * 3,
        step: Math.PI / 32,
      },

      v: {
        min: 0,
        max: Math.PI * 2,
        step: Math.PI / 20,
      },

      x: function (u, v) {
        if (u < startRadian) {
          return (
            offsetX +
            Math.cos(startRadian) * (1 + Math.cos(v) * k) * hoverRate
          )
        }
        if (u > endRadian) {
          return (
            offsetX + Math.cos(endRadian) * (1 + Math.cos(v) * k) * hoverRate
          )
        }
        return offsetX + Math.cos(u) * (1 + Math.cos(v) * k) * hoverRate
      },

      y: function (u, v) {
        if (u < startRadian) {
          return (
            offsetY +
            Math.sin(startRadian) * (1 + Math.cos(v) * k) * hoverRate
          )
        }
        if (u > endRadian) {
          return (
            offsetY + Math.sin(endRadian) * (1 + Math.cos(v) * k) * hoverRate
          )
        }
        return offsetY + Math.sin(u) * (1 + Math.cos(v) * k) * hoverRate
      },

      z: function (u, v) {
        if (u < -Math.PI * 0.5) {
          return Math.sin(u)
        }
        if (u > Math.PI * 2.5) {
          return Math.sin(u)
        }
        return Math.sin(v) > 0 ? 1 * height : -1
      },
    }
  }
  // 生成模拟 3D 饼图的配置项
  function getPie3D(pieData, internalDiameterRatio) {
    let series = []
    let sumValue = 0
    let startValue = 0
    let endValue = 0
    let legendData = []
    let k =
      typeof internalDiameterRatio !== 'undefined'
        ? (1 - internalDiameterRatio) / (1 + internalDiameterRatio)
        : 1 / 3

    // 为每一个饼图数据，生成一个 series-surface 配置
    for (let i = 0; i < pieData.length; i++) {
      sumValue += pieData[i].value

      let seriesItem = {
        name:
          typeof pieData[i].name === 'undefined'
            ? `series${i}`
            : pieData[i].name,
        type: 'surface',
        parametric: true,
        wireframe: {
          show: false,
        },
        pieData: pieData[i],
        pieStatus: {
          selected: false,
          hovered: false,
          k: k,
        },
      }

      if (typeof pieData[i].itemStyle != 'undefined') {
        let itemStyle = {}

        typeof pieData[i].itemStyle.color != 'undefined'
          ? (itemStyle.color = pieData[i].itemStyle.color)
          : null
        typeof pieData[i].itemStyle.opacity != 'undefined'
          ? (itemStyle.opacity = pieData[i].itemStyle.opacity)
          : null

        seriesItem.itemStyle = itemStyle
      }
      series.push(seriesItem)
    }

    // 使用上一次遍历时，计算出的数据和 sumValue，调用 getParametricEquation 函数，
    // 向每个 series-surface 传入不同的参数方程 series-surface.parametricEquation，也就是实现每一个扇形。
    for (let i = 0; i < series.length; i++) {
      endValue = startValue + series[i].pieData.value
      // console.log(series[i])
      series[i].pieData.startRatio = startValue / sumValue
      series[i].pieData.endRatio = endValue / sumValue
      series[i].parametricEquation = getParametricEquation(
        series[i].pieData.startRatio,
        series[i].pieData.endRatio,
        false,
        false,
        k,
        series[i].pieData.value,
      )

      startValue = endValue

      legendData.push(series[i].name)
    }
    return series
  }
</script>
 
<style>
  .echartDiv { width: 100%; height: 100%; }
  .s { color: rgb(253, 251, 253); }
</style>
